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Contains the parser program's class that to create the ST of an input phrase.

USAGE:

ex:
Parser parserProgram = (Parser)parser.parse();
parserProgram.setInput(input_string);                  
		switch(parserProgram.parse()){
			case ACCEPT:	
				St st = new St(parserProgram.getHistory());  //create the ST
				st.initFromHistory();
				return st.getRoot();
			case ERROR:
			return null;
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